Air-pump.



G. P. WISDOM.

AIB PUMP.

APPLICATION FILED Arms, 1910.

Patented Jan. 21, 1913.

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A UNiTEDsTATEs PATENT OFFICE.

GERGE-P. WISDOM, OFI-DENVER, COLORADO, ASSIGNOR F ONE-THIRD T0 WILlLIAM H. PERRY AND ONE-THIRD TO JOHN C. ANDERSON, BOTH OF DENVER, COLORADO.

Maru-Mr.

Specification of Letters Patent.

Patented J all. 21, 1913.

Application iled April 5, 19.16. Serial No. 553,637".r

To all whom t may concern.'

Be it known that l, GEORGE P. WISDOM,

a citizen of the United States of America,-

` Pumps, of which the following is a specilication.

rllhis invention relates to air pumps' of' the type characterized by a cylinder 1n which a rotatory element is eccentrically mounted and provided with pistons which, during the movement of the said element,

are centrifugally brought in contact with the inner surface of the cylinder.

My invention is particularly adapted 4to beused in connection with a vacuum 'cleaning systemvand its principal object resides in the provision of a rotary pump of simple, though highly efficient construction7 in which the friction between the moving and stationary parts is reduced to a minimum and which in consequence may be operated at a high rate of velocity and driven in direct connect-ion with the shaft of a motor.

@ther objects of my invention reside in providing a means whereby the resistant inHuence of the displaced air vupon the rotatory and reciprocatory parts of the pump is substantially eliminated; in the provision of a mechanism which will displace the maximum amount of air admitted through the inlet port of the pump in the minimum 'of time, and in providing an adjustment through the instrumentality of which the capacity of the pump may be varied and the flow of air between its inlet and exhaust ports may be reversed without changing the direction of rotation of its rotatory element.

l attain the above objects, as well as" Referring to the drawings by numerals,

l 2 designates the hollow cylindrical housing which is 4supported upon aitherewith integral pedestal 3, and in which a rotatory drum 4 is eccentrically mounted. The drum l is provided with a plurality of equidistant, radialslots 5 in which pistons 6 have a reciprocatory movement. During the rotary movement of the drum 4, these pistons are, centrifugally, projected against the inner surfaceof the drum, and to reduce theconsequent friction, they are composed of hollow, open-ended cylinders which have a rolling contact with the cylinder wall and which are constantly cooled by the air circulating through their interiors.

The drum 4 is rigidly mounted upon a shaft 7 the ends of which project through eccentric bores in bearing-sleeves 8 which are adjustably mounted in hollow bosses 9 extending outwardly from the cylinderheads 10, and which arelined with bushings 12 of Babbitt or other suitable material for the usual purpose. A coupling 28 att-ached at one end of the sha-ft 7 serves to operatively connect it with the shaft of a motor.

The cylinder-heads 10 which are secured to external anges 14 on the housing, by means of bolts 15, are formed in their inner surfaces with depressions 16 and 17 which from points 18 and 19, at opposite sides of the point of nearest approach 20 of the drum Il to the inner surface of the cylinder 2, taper in opposite directions toward the said point of approach, and terminate in close proximity thereto. The depressions 16 register-at their widest portions with 'a laterally extending duct 21 in the upper portion of the housing, which communicates with the centrally disposed air-inlet22, and the depressions 17. through which, in practice, the air is exhausted from the cylinder, connect at their widest extremities with the orifices of outwardly iiaring exhaust conf duits 23 formed integral with the heads 10.

The eccentric sleeves 8 which are held against rotation by means of set-screws 24, project beyond the ends of the bosses 9, and their exterior portions are fitted in corre spondingly bored extremities of levers 25 to which they are secured by the useo set screws 26. The levers 25 are connected by means of a cross-bar 27 v for the purpose of insuring a simultaneous and corresponding movement of the bearing-sleeves 8 in the bosses 9, when it is desired to adjust the position of the element 4 relative to the cylinder in which it iS mounted.

In the operation of my improved airpump', during the process of cleaning by vacuum, the inlet 22 is connected with the end of a preferably flexible conduit, which at its Afree extremity, carries a nozzle which is held in contact with a surface to be cleaned. a The rapid rotatory movement of the element 4 and the therewith associated pistons 6, which are centrifugally projected I proach of the drum 4 with the surface of the cylinder, and the air occupying the said passage is in graduallv increasing ouantities displaced by a piston moving 1n the direction of the arrow in Fig. 1, upwardly from` said point of approach, until it has passed; the widest extremity of the depressions 16, whence the body of air conned between the said piston and the precedingone is con veyed to the exhaust ports.

Inasmuch as by the above described arrangement, the pistons are at no time brought in sudden contact with the body of air drawn into the cylinder through the inlet 22, the rotatory movement of the element 4, will be equable and uniform. The gradual admission of air between each two consecutive pistons while they approach the point of inlet insures the displacement of the entire body of air-drawn in each time a piston passes the port 22, and back pressure of the air against the piston approaching thesaid port is substantially negatived by the air which, entering the space between said piston and the succeeding one from the passages 16, prevents the formation of even a partial vacuum. The tapering passages 17 which extend from the point of exhaust 19 to thepoint of approach 20, are also an essential factor in the effective operation of the pump. They positively prevent'air being carried in between the consecutive pistons past the fpoint 2O and -thus insure the discharge o the entire body of displaced air.

VTo reverse the operation of the pump for the purpose of forcing air into the conduit connected with the inlet 22 instead of exhausting it therefrom,'the position of the drum is, by manipulation of the levers 25 and through the instrumentality of the ec- Acentric bearing-sleeves 8, adjusted until its point of nearest approach to the interior surface of the cylin er is diametrically op: posite to that shown in the drawings, withthe result that while the direction of rota- .tion of the-element 4 remains unchanged, Vthe air will now be drawn in through the tively smally arc while conveyingair from the inletto .the exhaust ports, heating due to compression of the air as well as its frictional contact with the cylinder wall; is ma- 1 terially reduced, the circulation of air through the hollow pistons, constantly cools them, while the rolling contact of the pistons with the interior surfaceof the housing produces but little friction between the mov-v ingand relatively stationary parts.

The above enumerated features coperate in permitting the operation of the pumpat aV high rate of speed so that it may be directly connected with the shaft of a motor.

Having thus described my invention, what I'claim and desire to secure-by Letters Patent is 1.l An air pump comprising a rotary element formed with a series of radial slots;-

a hollow cylinder wherein said element is eccentrically mounted provided at one side of the point of nearest approach of the saidelement to its circumferential surface with an air outlet port, and at the opposite side thereof with an air inlet port; and a series of open-ended hollow pistons disposed in saidv slots and adapted to move centrifugally when said element is rotated, the end members of the cylinder being formed upon their inner surfaces with pairs of alining arcuate air passages which taper in opposite directions toward the said point and which communicate at their widest portions one with the inlet port andthe other with the outlet port, to releve compression and back pressure, the ends of said pistons registering with the adjacent passages during a portion of their travel with said element to permit a circulation of air through their interiors.

2. An air pump comprising a rotary element formed with a series of radial slotsg.

a hollow cylinder wherein said element is eccentrically mounted provided at one side of the point of nearest approach of the said element to its circumferential surface with an air outlet port, and at the opposite side thereof with an air inlet port; and a series of pistons disposed in said slots and adapted to move centrifugally when said element is rotated, the end members of said cylinder being formed upon their inner surfaces with pairs of alining larcuate air passageswhich Loameo i taper in opposite directions toward the said point anni. which communicate at their Wides; portions one with the inlet port, and the other with the outieteport, to relieve compression and hack pressure.

3. A11 air pump comprising a rotary eie- `ment formed with a series of radiaiL siots;

a hollow cylinder wherein said eiement is eooentrieaiy mounted provided at opposite sides with air inle'l and exhaust ports, the end members of saic Cylinder being formed upon their inner surfaces with pafms of air passages which eommunieae one with the inlet port and the oher with the ont-let of their Vtravel with said eiement to permit 20 a Circulation of air through their interiors. n testimony whereof l have affixed my signature in presence of two Witnesses.

- GEORGE P. WISDOM.

Witnesses:

G. J. ROLLANDET, 3. C. ANDERSON. 

